Apparatus for crosswise riveting and for other striking work



Feb. 21, 1939. E, BECKER 2,147,687

APPARATUS FOR CROSSWISE RIVFITING AND FOR OTHER STRTKTNG WORK Filed July 15, 1936 Emll \N TOK Patented Feb. 21, 1939 APPARATUS FOR CRDSSWISE RIVETING AND FOR OTHER STRIKING WORK Emil Becker, Dessau, Germany.

Application July 15, 1936, Serial No. 90,688 M In Germany May 11, 1934 3 Claims. (01.78-51) There has hitherto been lacking a device or an automatic tool under which riveting blows could be carried out with deflection of the striking direction satisfactorily and effectively from within inaccessible places without the tool being held in position. This purpose cannot be achieved by simply applying known deflecting devices for movement resulting from impact, such as simple angle levers, or eccentrics or pusher rods with inclined surfaces as used for introducing and holding rivets to be struck in usual manner, for the carrying out of the rivet blows themselves. According to the present invention satisfactory cross-wise riveting in the above sense is obtained by forming the, whole apparatus as a stationary blocklor housing with means in said housing to deflect the striking direction, the recoil being taken up by a sufllcient stationary inertia mass arranged in, or in combination with, the housing.

The present invention may be carried out in various ways. The apparatus can work at an angle to the axis of the ram by means of an easily deformable, practically incompressible mate- '25 rial having a high bulk modulus of elasticity,

such as rubber and other deformable solid substances or liquids, which is introduced between ram or hammer and striker bolt into a housing of suflicient mass disposed in the axis of the striker'bolt. The housing or the block can, however, have a smaller mass if, for example with interior riveting of tubes, said mass is disposed opposite to the striker bolt and adjacent the tube wall and a suflicient additional mass is provided outside the tube adjacent the same wall.

The striking deflection can also be eflected by the ram acting with an inclined surface directly on a correspondingly inclined sliding surface of the striker bolt, or the blow may be. de-

40 flected by means of a fitting introduced between ram and striker bolt. 7

Only a small mass is suitably, given to the striker bolt, or the like.

The tool now to be described as an example,

46 has been constructed for the riveting of thin wise riveting in a long hollow workpiece.

Figs. 3 and 4 are respectively, longitudinal and transverse sectional views of the housingof a tool with deflection bolts.

Figs. 5 and 6 are similar views to Figs. 3 and 4 10 but showing a curved deflecting member.

Fig. 7 illustrates a working installation for mass production of hollow bodies with a device controllablefrom the working place. r Fig. 8 illustrates the construction of the con- 15 trol member.

Referring to Fig. 1 of the drawing, the latter shows a pressure air hammer, having its mouthpiece a provided exteriorly with a screw thread b. 0n the screw thread is screwed the housing 0 20 which encloses a practically incompressible material d having a high bulk modulus of elasticity, as for instance soft rubber. e denotes the ram of the pressure air hammer striking on the substance 11.

Because the substance d is enclosed on all sides, it can move only against the boring provided for the striker bolt 1. Thus the striking action is transmitted from c to f, whereby ,f jumps correspondingly out of the aperture and 30 imparts strokes to the shank of the rivet i.

, Fig. 2 illustrates the constructional parts,

' which in the example taken consist of two plates y and a U-section h. iis a rivet introduced from the outside, which rivet receives its head formation on the inside by the striking action of ,f. In order to take up the powerful recoil, the housing 0 has a relatively large mass, since the mass contained in the pressure air tool cannot be utilised because of the deflected striking direction. 40

According to another embodiment of the invention the housing 0 abuts against the inner wall of the work-piece opposite the striker bolt at k, and an additional mass 1 is disposed outside the workpiece. This arrangement is particularly advantageous with workpieces having a very narrow free passage for the tool so that only a relatively small mass can be introduced into the work piece, since the additional mass 1 acts as an 1 enlargement of the mass 6. The housing may be provided with working apertures i in a number of directions, which apertures may be closed by closure plugs or screws in such a way that the stroke may be deflected towards any opened working aperture which has been fitted with a striker bolt. In this case it is advisable to construct the housing or block entirely or partly of spherical shape or with a suitable polygonal proille.

The desired stroke deflection can also be effected by various other means, for example as shown in Figs. 3 and 4, by the arrangement.

of two bolts m and n disposed at the desired angle.

The inward movement of m is transformed into an outward movement of n by means of the inclined sliding surfaces P.

For the alteration or displacement of its mass, the housing may be composed of a plurality of tightly fitting pieces, c, c, which can be separated as desired and replaced by others in dilferent combinations (see Fig. 3).

Figs. 5 and 6 illustrate as another example an elbow qu arranged between the two rams n and m. This elbow may be made of steel, rubber or any other suitable substance.

The apparatus described can be used in the way illustrated for effecting interior riveting, that is for striking rivets from the interior of hollow workpieces in order to form the rivet head on the inside when the rivets are inserted from the outside. The apparatus may also be used where the deflection of the striking movement is necessary for better accessibility.

For carrying out successive riveting operations at different points of one work piece or on different work pieces in rapid succession, the housing of the riveting tool is advantageously connected to the anvil mass, so as to assume always a position precisely opposite the latter.

Fig. '7 illustrates a constructional example, wherein r is the riveting tool constructed for deflected striking; s is the anvil outside of the work-piece, u a curved holder connecting r and s, which may be formed as a pipe for feeding the operating medium. 0 is a handle and also a control member for the operating medium. to is the workpiece to be riveted and t an additional mass.

Fig. 8 shows a constructional example in which the operation of the striking tool is controlled by rotating the anvil s. The anvil carries at its top a handle and is provided below the handle with a rotatable pin which has at its end a recess for the rivet head.

The rotatable pin is'provided in its midportion with an eccentric 1 which changes its position upon rotation of the handle, and causes operation of a rod 2. The rod 2 controls a closure member as for example a cock or valve for compressed air, which member may be arranged in the. conduit u according to Fig. 7.

For connection to the rotatable anvil the pipe it according to Fig. '1 is provided with an end bearing :1: according to Fig. 8.

If the striker bolt 1 shown in Figs. 1 and 2 is exchanged for a chisel or the like, the tool may also be used for the treatment of metal, stone, rock, for example in quarries and mines, of concrete, wall work in a building, and so forth.

The hammering device or the like, may form a part of the deflection casing. The deflection casing may, however, be constructed as a separate unit, and if desired, may be arranged for mounting different sizes of hammering devices.

I claim:

1. Apparatus for crosswise riveting and similar striking work, comprising a housing having a working aperture in one direction, a hammering device mounted on said housing and including a reciprocating element projecting into said housing through an aperture disposed in a direction dlil'erent from that of said working aperture, an easily deformable and practically incompressible material filling said housing, and a striking tool oscillably mounted in said working aperture, said housing having a mass sumcient to take up the recoil of said striking tool, whereby said hammering device is adapted to oscillate said striking tool against the inside wall of a relatively narrow hollow work piece.

2. Apparatus for crosswise riveting and similar striking work, as claimed in claim 1, comprising further an anvil-mass and a curved holder with elongated arms connecting said hammering device to said anvil-mass to ensure the mutual position of the axis of the striking tool and of the center of gravity of said anvil-mass.

3.Apparatus for crosswise riveting and similar striking work, as claimed in claim 1, comprising further an anvil-mass and a curved holder with elongated arms connecting said hammering device to said anvil-mass to ensure the mutual position of the axis of the striking tool and of the center of gravity of said anvil-mass, said holder being adapted to supply the operating medium, and said anvil-mass being constructed as a rotatable handle for controlling the supply of the operating medium.

EMIL BECKER. 

